mframejs

<!doctype html> <html lang="en"> <head> <title>Code coverage report for mframejs/binding/ast/ast.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="..\..\..\prettify.css" /> <link rel="stylesheet" href="..\..\..\base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(..\..\..\sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="..\..\..\index.html">All files</a> / <a href="index.html">mframejs/binding/ast</a> ast.ts </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 90.53% Statements 86/95 </div> <div class='fl pad1y space-right2'> 96.55% Branches 28/29 </div> <div class='fl pad1y space-right2'> 94.12% Functions 16/17 </div> <div class='fl pad1y space-right2'> 90.53% Lines 86/95 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a href='#L16'>16</a> <a name='L17'></a><a href='#L17'>17</a> <a name='L18'></a><a href='#L18'>18</a> <a name='L19'></a><a href='#L19'>19</a> <a name='L20'></a><a href='#L20'>20</a> <a name='L21'></a><a href='#L21'>21</a> <a name='L22'></a><a href='#L22'>22</a> <a name='L23'></a><a href='#L23'>23</a> <a name='L24'></a><a 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                2087x     213x   3x       210x   4x           319x   319x     1761x 1761x 1761x       491x 491x         826x             444x 444x               1761x 1761x 1761x   374x     1761x                       1020x 1020x 1020x     344x 344x 344x             1020x          </td><td class="text"><pre class="prettyprint lang-js">import { SymbolContainer } from './symbolContainer'; import { SymbolTemplate } from './symbolTemplate'; import { ITokens } from '../../interface/exported';     /** * Using Douglas Crockford paper on Vaughan Pratt "Top Down Operator Precedence" * For more info about this look here * https://crockford.com/javascript/tdop/tdop.html (added to docs folder so I dont loose it) * Not everything is used * * This class will do most of the heavy lifting of generating the AST for our expressions * It will need symbols added and a symbol container * */ export class AST {   public behavior: any; public valueConverter: any; private tokens: ITokens[]; public currentStatement: any = null; public currentTokenIndex = 0; public currentToken: any; private symbolContainer: SymbolContainer; public statementsArray: any[];     /** * start the parsing of tokens * */ public start(tokens: ITokens[]) { // set tokens this.tokens = tokens;   // clear this.currentStatement = null; this.currentTokenIndex = 0; this.currentToken = null;   // get first token this.advance();   // generate ast const ast = this.statements();   // return ast return ast; }       /** * adds symbol container we will use to get/set our symbols * */ public addSymbolContainer(symbolContainer: SymbolContainer) { this.symbolContainer = symbolContainer; }       /** * Symbol id and an optional binding power that defaults to 0 and returns a symbol object for that id. * If the symbol already exists in the symbol_table, the function returns that symbol object. * Otherwise, it makes a new symbol object that inherits from the symbolTemplate, stores it in the symbol container, and returns it. * A symbol object initially contains an id, a value, a left binding power, and the stuff it inherits from the symbolTemplate. * */ public symbol(id: string, bp?: number) { let s = this.symbolContainer[id]; bp = bp || 0; if (s) { if (bp >= s.lbp) { s.lbp = bp; } } else { s = new SymbolTemplate(); s.id = s.value = id; s.lbp = bp; this.symbolContainer[id] = s; }   return s; }       /** * Prefix operators are right associative. * A prefix does not have a left binding power because it does not bind to the left. * Prefix operators can also sometimes be reserved words. * */ public prefix(id: string, nud?: Function) { const s = this.symbol(id); const astInstance = this; s.nud = nud || function () { // scope.reserve(this); this.first = astInstance.expression(70); this.arity = 'unary';   return this; };   return s; }       /** * The infix function takes an id, a binding power, and an optional led function. * If a led function is not provided, the infix function supplies a default led that is useful in most cases. * */ public infix(id: string, bp?: number, led?: Function) { const s = this.symbol(id, bp); const astInstance = this; s.led = led || function (left: any) { this.first = left; this.second = astInstance.expression(bp); this.arity = 'binary';   return this; };   return s; }       /** * Those infix operators are left associative. * We can also make right associative operators, such as short-circuiting logical operators, by reducing the right binding power. * */ public infixr(id: string, bp: number, led?: Function) { const s = this.symbol(id, bp); const astInstance = this; s.led = led || function (left: any) { this.first = left; this.second = astInstance.expression(bp - 1); this.arity = 'binary';   return this; };   return s; }       /** * The stmt function is used to add statement symbols to the symbol table. It takes a statement id and an std function. * */ public stmt(id: string, f: Function) { const x = this.symbol(id); x.std = f;   return x; }       /** * We could use infixr to define our assignment operators, * but we will make a specialized assignment function because we want it to do two extra bits of business: * examine the left operand to make sure that it is a proper lvalue, * and set an assignment member so that we can later quickly identify assignment statements. */ public assignment = function (id: string) { const astInstance = this;   return this.infixr(id, 10, function (left: any) { if (left.id !== '.' && left.id !== '[' && left.arity !== 'variable') { left.error('Bad lvalue.'); } this.first = left; this.second = astInstance.expression(9); this.assignment = true; this.arity = 'binary';   return this; }); };       /** * The statement function parses one statement. * If the current token has an std method, the token is reserved and the std is invoked. * Otherwise,we assume an expression statement terminated with a semi-colon. * For reliability, we will reject an expression statement that is not an assignment or invocation. * */ public statement() { const n = this.currentToken; let v; if (n.std) { this.advance(); // scope.reserve(n);   return n.std(); } v = this.expression(0);   return v; }       /** * The statements function parses statements until it sees (end) or } which signals the end of a block. * The function returns a statement, an array of statements, or null if there were no statements present. * */ public statements() { this.statementsArray = []; let s; while (true) { if (this.currentToken.id === '}' || this.currentToken.id === '(end)') { break; } s = this.statement(); if (s) { this.statementsArray.push(s); } }   return this.statementsArray.length === 0 ? null : this.statementsArray.length === 1 ? this.statementsArray[0] : this.statementsArray; }       /** * The advance function makes a new token object from the next simple token in the array and assigns it to the token variable. * It can take an optional id parameter which it can check against the id of the previous token. * The new token object's prototype is a (name) token in the current scope or a symbol from the symbol table. * The new token's arity is "name", "literal", or "operator". * Its arity may be changed later to "binary", "unary", or "statement" when we know more about the token's role in the program. * */ public advance(expected?: string) {   let type, o, token, value; token = this.tokens[this.currentTokenIndex];   if (token && expected) { const nextToken = this.tokens[this.currentTokenIndex + 1]; if (expected === '}' && nextToken && (nextToken.value === '|' || nextToken.value === '&')) { return; }   // -> will happend if signle inside expression ${values | valuconverter} const prevToken = this.tokens[this.currentTokenIndex - 1]; if (expected === '}' && prevToken && (prevToken.value === '|' || prevToken.value === '&')) { return; } }     if (this.currentTokenIndex >= this.tokens.length) { this.currentToken = this.symbolContainer['(end)'];   return; }   this.currentTokenIndex += 1; value = token.value; type = token.type;   if (type === 'variable') {   type = 'variable'; o = this.symbolContainer['(variable)'];     } else if (type === 'operator') {   o = this.symbolContainer[value]; if (!o) { console.warn('Unknown operator.', token); }   } else if (type === 'string' || type === 'number') {   type = 'literal'; o = this.symbolContainer['(literal)'];   } else {   console.warn('Unexpected token.', token);   }   this.currentToken = Object.create(o); this.currentToken.value = value; this.currentToken.arity = type; if ((<any>token).root) { this.currentToken.root = true; }   return this.currentToken; }       /** * The heart of Pratt's technique is the expression function. * It takes a right binding power that controls how aggressively it binds to tokens on its right. * */ public expression(rbp: any) { let left; let token = this.currentToken; this.advance(); left = token.nud(); try { while (rbp < this.currentToken.lbp) { token = this.currentToken; this.advance(); left = token.led(left); } } catch (e) { console.warn('parser fail');   }   return left; }     }  </pre></td></tr> </table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Sun Feb 24 2019 17:27:50 GMT+0100 (Central European Standard Time) </div> </div> <script src="..\..\..\prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="..\..\..\sorter.js"></script> <script src="..\..\..\block-navigation.js"></script> </body> </html>